22RE Headers....tri-Y or 4-1
 

Which header layour will work best for mileage and power increases on a 22RE....Tri-Y or 4 into 1????

i've heard the tri-y is best for torque.

It depends on what RPM range you are trying to improve. Tri-Y is good for low to mid, and 4 into 1 is good for mid to high RPMs.

I imagine for fuel efficiency I want to improve my low end. So tri-Y it is. That is what I thought, but I just wanted a 2nd opinion

I agree with Glenn's feedback.

A Tri-Y offers good low to mid which means better miles per gallon and slightly more torque. If you haven't already done this, add a cold air intake or a performance K&N air filter (not FIKA) to aid in getting more air to the pistons. Boring the throttle body and porting the plentum would help too. Both are expensive tuning mods that don't add up to dollars vs return of HP/torque/MPG but, don't hurt reliability of your great 22RE.

A cam change offering a greater valve open duration and a 4 to 1 exhaust would make it scream down the highway at higher RPM's add more horse power. But, reliability might suffer in the process.

Tri-Ys are great.

Amusement...why do you say not to add the K&N FIPK????

Amusement...why do you say not add the K&N FIPK??? - Deathrunner

I recently learned there is a negative effect on engine performance using an airtake system that takes in any part of the air in the engine compartment. I't something like .3% HP loss for ever degree above 70F @ sea level. An engine compartment makes about 130 - 150F. So you could loose about 18% HP taking in 130F engine compartment air. This info was provided my Holly Performance carbs under the category of air density to increase volume metric effeciency.

I would recommend a high flow air filter taking air from the outside of the engine compartment. wheel well, grill or RAM scoop would increase the air density by taking in cooler air that is 6% higher pressure of atmsophere.

In short cool air, greater volume via performance air filter, slight more pressure (6%) forcing it into the throttle body via scoop or RAM equals more usuable HP. And the best part for your EFI ECU is that it can handle the change without any additional programming or tuning tweaks and no reliability problems. Just be careful about water getting into air instake. Water doesn't compress under the piston without something MAJOR breaking.